A single thrust bearing fluid dynamic bearing (FDB) design, including a typical
dynamic bearing design which has a ring-shaped or circular thrust plate mounted
at or near the end of a shaft, wherein the shaft defines together with the surrounding
sleeve a journal bearing by providing grooves on one of the two surfaces facing
the gap between the shaft and sleeve. On the thrust plate, only one of the two
surfaces is grooved to establish an active thrust bearing. The rotor is then biased
against the single active thrust bearing with a constant force generated by a magnetic circuit.
